DAVdroid is the only all-in-one synchronization solution for your contacts (CardDAV), calendars (CalDAV) and tasks (based on VTODO). The application is easy to configure and integrates seamlessly with your favorite calendar / contact application (including default applications). It can also be used separately if you have CalDAV, CardDAV or only tasks. Seamless integration with your device and your favorite apps Easy configuration (automatic discovery of resources, support for self-signed certificates, authentication by client certificates) Algorith Fast algorithms for high performance (CTag / ETag, limit of the synchronization range for past events)